| CARE | Centre d'Anthropologie Religieuse Européenne (http://care.ehess.fr) | In French | → Research institutes → Religion, theology → Anthropology |
| CARLA | Center for Advanced Research on Language Acquisition (www.carla.umn.edu) | In English | → Education → Language, linguistics, literature |
| CARUM | Club des Anesthésistes Réanimateurs Urgentistes Militaires | In French | → Anesthesiology |
| CASA | Confederazione Autonoma Sindacati Artigiani | In Italian | |
| CASA | Canadian Asian Studies Association | In English | → Associations → Language, linguistics, literature → Geography, biography, history |
| CAST | Centro per un Appropriato Sviluppo Tecnologico | In Italian | → Development → Engineering, technology |
| CAST | Council for Agricultural Science and Technology (www.cast-science.org) | In English | → Agricultural sciences |
| CATIE | Centro Agronómico Tropical de Investigación y Enseñanza (www.catie.ac.cr) | In Spanish | → Research institutes → Agricultural sciences |
| CAUCE | Coalition Against Unsolicited Commercial Email | In English | → Networks, communication → Telecommunications |
| CAUG | Civil Aviation Users Group | In English | → Aeronautics, aircraft → Transport and postal services |
| CAUZ | Consortium of Aquariums Universities and Zoos | In English | → Zoology |
| CAYN | Central Asian Youth Network | In English | |
| CBCA | Canadian Border Collie Association | In English | → Associations |
| CBEMA | Computer and Business Equipment Manufacturers Association | In English | → Associations → Hardware |
| CBETA | Chinese Buddhist Electronic Text Association | In English | → Associations → Buddhism → Literature |
| CBFA | Chesapeake Bay Flag Association (http://cbfa.vexillology.info) | In English | → Associations → 9299 |
| CBI | Confederation of British Industry | In English | → Industry, industrial policy |
| CBL-G | Cercle Bernard Lazare - Grenoble | In French | |
| CBRL | Council for British Research in the Levant | In English | → Area studies |
| CBS | Centraalbureau voor Schimmelcultures (www.cbs.knaw.nl) | In Dutch | → Research institutes → Biological sciences |
| CBSG | Conservation Breeding Specialist Group (www.cbsg.org) | In English | → Nature and society |
| CBSS | Council of the Baltic Sea States = CEMB | Conseil des États de la mer Baltique | In French = BDDK | Baltık Denizi Devletleri Konseyi | In Turkish |
In English | → International relations |
| CBW | Centrale Branchevereniging Wonen | In Dutch | |
| CC | Confederación de Cuadros | In Spanish | → Labour, labour economics |
| CCAB | Consejo Centroamericano de Bosques | In Spanish | → Forestry |
| CCAB-AP | Consejo Centroamericano de Bosques y Áreas Protegidas = CCAB-AP | Conselho Centro-americano de Florestas e Áreas Protegidas | In Portuguese |
In Spanish | → Nature → Forestry |
| CCAB-AP | Conselho Centro-americano de Florestas e Áreas Protegidas = (look above) |
In Portuguese | → Nature → Forestry |
| CCAC | Canadian Council on Animal Care (www.ccac.ca) | In English | |
| CCAP | Consejo Centroamericano de Areas Protegidas | In Spanish | → Nature |
| CCASLS | Canadian Council of Area Studies Learned Societies | In English | → Area studies |
| CCbdx | Collectif des Câblés de Bordeaux | In French | → Networks, communication |
| CCC | Customs Co-operation Council | In English | → International economic cooperation |
| CCCB | Canadian Conference of Catholic Bishops = CECC | Conférence des Évêques Catholiques du Canada | In French |
In English | → Roman catholic church |
| CCCI | Conselho Canadense para Cooperação Internacional (www.ccic.ca) = CCCI | Consejo Canadiense de Cooperación Internacional | In Spanish = CCIC | Canadian Council for International Cooperation | In English = CCCI | Conseil Canadien pour la Coopération Internationale | In French |
In Portuguese | → International relations |
| CCCI | Consejo Canadiense de Cooperación Internacional (www.ccic.ca) = CCIC (look above) |
In Spanish | → International relations |
| CCCI | Conseil Canadien pour la Coopération Internationale (www.ccic.ca) = CCIC (look above) |
In French | → International relations |
| CCCPA | Consortium des Collèges Communautaires des Provinces de l’Atlantique | In French | |
| CCCPA | Chicago Chinese Computing Professional Association | In English | → Associations → Computer science |
| CCDE | Comité Consultatif de Déontologie et d'Éthique | In French | → Ethics |
| CCEC | Commission Consultative de l'Évaluation des Charges | In French | |
| CCFA | Comité des Constructeurs Français d'Automobiles | In French | → Automobile manufacturing |
| CCFE | Communauté des Chemins de Fer Européens | In French | → Transport and postal services |
| CCHA | Community College Humanities Association | In English | → Associations → Education |
| CCI | Chambre de Commerce Internationale (www.iccwbo.org) = ICC | International Chamber of Commerce | In English = CCI | Cámara de Comercio Internacional | In Spanish = CCI | Câmara de Comércio Internacional | In Portuguese |
In French | → Trade |
| CCI | Cámara de Comercio Internacional (www.iccwbo.org) = ICC (look above) |
In Spanish | → Trade |
| CCI | Câmara de Comércio Internacional (www.iccwbo.org) = ICC (look above) |
In Portuguese | → Trade |
| CCI | Chambers of Commerce of Ireland | In English | → Trade |
| CCIC | Canadian Council for International Cooperation (www.ccic.ca) = CCCI (look above) |
In English | → International relations |
| CCIERBC | Comité Consultatif INRETS d'Éthique sur la Recherche Biomédicale et Comportementale | In French | → Ethics → Medicine → Transport and postal services |
| CCIFE | Chambre de Commerce et d'Industrie Française à l'Étranger | In French | → Industry, industrial policy → Trade |
| CCIP | Chamber for Cooperation and Incentive Partnership | In English | |
| CCIR | International Radio Consultative Committee | In English | → Telecommunications |
| CCITT | Comité Consultatif International pour le Téléphone et le Télégraphe | In French | → Telecommunications |
| CCL | Confédération du Commerce luxembourgeois | In French | → Trade |
| CCM | Comitato Collaborazione Medica | In Italian | → Medicine |
| CCNI | Comité Consultatif National de l’Immunisation | In French | → Immunology and allergy → Pharmacology, toxicology |
| CCP | Confederação do Comércio e Serviços de Portugal | In Portuguese | → Industry, industrial policy → 33846 |
| CCP | Confederación de Cuadros y Profesionales | In Spanish | → Labour, labour economics |
| CCP | Conseil Canadien du Porc (www.cpc-ccp.com) = CPC | Canadian Pork Council | In English |
In French | → Agricultural sciences → Food technology |
| CCPA | Conseil Canadien de Protection des Animaux | In French | → Nature and society |
| CCPM | Comité Central des Pêches Maritimes | In French | → Fishing, hunting |
| CCQ | Commission de la Construction du Québec (www.ccq.org) | In French | → Building |
| CCQ | Centre de Conservation du Québec (www.ccq.mcc.gouv.qc.ca) | In French | → Museums |
| CCRRDT | Comité Consultatif Régional pour la Recherche et le Développement Technologique | In French | → Research policy → Engineering, technology |
| CCS | Comité Consultatif Scientifique | In French | → Mathematics and natural sciences |
| CCSDS | Consultative Committee for Space Data Systems | In English | → Electronics → Spaceflight engineering, astronautics |
| CCSEAS | Canadian Council of Southeast Asian Studies | In English | → Language, linguistics, literature → Geography, biography, history |
| CCW | Confédération Construction Wallonne (www.ccw.be) | In French | → Building |
| CCWH | Coordinating Council for Women in History | In English | → History |
| CDC | Computer Development Center | In English | → Research institutes → Computer science |
| CDEFI | Conférence des Directeurs des Écoles Françaises d'Ingénieurs | In French | → Specialized or (poly)technical colleges |
| CDERA | Caribbean Disaster Emergency Response Agency (www.cdera.org) | In English | → Natural disasters |
| CDHR | Comité Départemental d’Habitat et d’aménagement Rural | In French | → Agricultural sciences → Regional planning |
| CDI | CDNL Committee on Digital Issues | In English | → Libraries |
| CDIAC | Carbon Dioxide Information Analysis Center | In English | → Research institutes → Meteorology, climatology |
| CDS | Combinatie Dordrecht Sultana | In Dutch | → Sport, physical exercises |
| CDS | Cognitive Development Society | In English | → Psychology |
| CDSL | Computer Data System Laboratory | In English | → Research institutes → Data |
| CDW | Combinatie Dorestad Wijk bij Duurstede | In Dutch | → Sport, physical exercises |
| CEA | Consumer Electronics Association | In English | → Associations → Electronics |
| CEA | Commissariat à l'Énergie Atomique | In French | → Research institutes → Nuclear, atomic, and molecular physics → Energy economics → Engineering, technology |
| CEA | Commissariat à l’Énergie Atomique | In French | → 5931 → Energy economics → 6210 |
| CEAL | Council on East Asian Libraries | In English | → Libraries |
| CEATAL | Comisión Empresarial de Asesoramiento Técnico en Asuntos Laborales | In Spanish | → Labour, labour economics |
| CEBED | Centre Belgo-Européen d'Études des Drapeaux | In French | → 9299 |
| CEBTP | Centre Expérimental du Bâtiment et des Travaux Publics | In French | → Research institutes → Civil engineering → Building |
| CEC | Comisión Especial de Comercio | In Spanish | → Trade |
| CEC | Confederación Española de Comercio | In Spanish | → Trade |
| CEC | Council for Exceptional Children | In English | → Education |
| CEC | Commission for Environmental Cooperation | In English | → International relations → Nature |
| CECA | Club d'Étude du Comportement Aviaire | In French | → Zoology |
| CECC | Conférence des Évêques Catholiques du Canada = CCCB (look above) |
In French | → Roman catholic church |
| CECE | Committee for the European Construction Equipment (www.cece-eu.org) | In English | → Civil engineering → Building |
| CECIMO | Comité Européen de Coopération des Industries de la Machine-Outil (www.cecimo.be) | In French | → Mechanical engineering |
| CEDAW | Committee for the Elimination of Discrimination against Women | In English | → Feminism |
| CEDEM | Centar za demokratiju i ljudska prava = CEDEM | Center for democracy and human rights | In English |
In Serbian | → Research institutes → Democracy → Fundamental rights |
| CEDEM | Center for democracy and human rights = (look above) |
In English | → Research institutes → Democracy → Fundamental rights |
| CEDIA | Consorcio Ecuatoriano para el Desarrollo de Internet Avanzado | In Spanish | → Internet → Telecommunications |
| CEDIM | Centro de Estudios sobre Derecho Internacional y Mundialización (www.cedim.uqam.ca) = CEDIM | Centre d'Études sur le Droit International et la Mondialisation | In French |
In Spanish | → Research institutes → Trade → International law |
| CEDIM | Centre d'Études sur le Droit International et la Mondialisation (www.cedim.uqam.ca) = (look above) |
In French | → Research institutes → Trade → International law |
| CEEA | Cercle d'Études Espérantistes de l'Ariège | In French | |
| CEEETA | Centro de Estudos em Economia da Energia, dos Transportes e do Ambiente | In Portuguese | → Research institutes → Nature → Energy economics → Applied sciences, technology |
| CEEI | Conselho Estadual de Educação Escolar Indígenas | In Portuguese | → Education |
| CEEMAN | Central and Eastern European Management Development Associations | In English | → Associations → Management |
| CEEP | Centre européen des entreprises à participation publique et des entreprises d'intérêt économique général | In French | → 3384 |
| CEEP | Centre Européen d'Etudes sur les Polyphosphates | In French | → 665 |
| CEFA | Comitato Europeo per la Formazione e l'Agricoltura | In Italian | → Education → 83 |
| CEFTA | Central European Free Trade Agreement | In English | → Associations → Trade |
| CEG | Cognitive Ergonomics Group | In English | → Human-computer interaction |
| CEGELY | Centre de Génie Électrique de Lyon | In French | → Research institutes → Electrical engineering |
| CEI | Comitato Elettrotecnico Italiano (www.ceiuni.it) | In Italian | → Electrical engineering |
| CEIAS | Centre d'Études de l'Inde et de l'Asie du Sud | In French | → Research institutes → Area studies |
| CEIS | Centro Italiano di Solidarietà | In Italian | |
| ĈEJ | Ĉeĥa Esperanto-Junularo | In Esperanto | |
| CEJ | Ceará Esperanto-Junularo | In Esperanto | |
| CEJIL | Center for Justice and International Law (www.cejil.org) | In English | → International law → Fundamental rights |
| CELAVAR | Comité d’Étude et de Liaison des Associations à Vocation Agricole et Rurale | In French | → Associations → Agricultural sciences |
| CELIOS | Club En Liefde Is Ons Streven | In Dutch | → Sport, physical exercises |
| CEMA | Cercle d'Échange du Monde Agricole | In French | → Agricultural sciences |
| CEMAC | Comunitat Econòmica i Monetària de l'Àfrica Central | In Catalan | → Economics → European Union |
| CEMB | Conseil des États de la mer Baltique = CBSS, BDDK (look above) |
In French | → International relations |
| CEMEF | Centre de Mise en Forme des Matériaux (www-cemef.cma.fr) | In French | → Research institutes → 620 |
| CEMS | Centre d'Étude des Mouvements Sociaux | In French | → Research institutes → Sociology |
| CEN | Creative Environmental Networks | In English | → Nature |
| CEOE | Confederación Española de Organizaciones Empresariales | In Spanish | → 3384 |
| CEPIS | Council of European Professional Societies | In English | |
| CEPIS | Centro Panamericano de Ingeniería Sanitaria y Ciencias del Ambiente (www.cepis.ops-oms.org) = CEPIS | Centro Pan-americano de Engenharia Sanitária e Ciências do Ambiente | In Portuguese |
In Spanish | → Environment, environmental sciences → Medicine |
| CEPIS | Centro Pan-americano de Engenharia Sanitária e Ciências do Ambiente (www.cepis.ops-oms.org) = (look above) |
In Portuguese | → Environment, environmental sciences → Medicine |
| CEPLIS | Conseil Européen des Professions Libérales | In French | |
| CEPMMT | Centre Européen de Prévision Météorologique à Moyen Terme (www.ecmwf.int) = ECMWF | European Centre for Medium-Range Weather Forecasts | In English |
In French | → Research institutes → Meteorology, climatology |
| CEPT | Conférence Européenne des Postes et Télécommunications (www.cept.org) | In French | → Telecommunications → Transport and postal services |
| CERB | Centre de Recherches Biologiques (www.cerb.fr) | In French | → Research institutes → Biological sciences |
| CERC3 | Chairmen of the European Research Councils' Chemistry Committees | In English | → Research policy |
| CERD | Committee on the Elimination of Racial Discrimination | In English | → Fundamental rights |
| CERF | Canine Eye Registration Foundation | In English | → Foundations → Ophtalmology → Veterinary medicine |
| CERIB | Centre d'Études et de Recherches de l'Industrie du Béton | In French | → Research institutes → Civil engineering → Building |
| CES | Confederación Europea de Sindicatos = CES | Confédération Européenne des Syndicats | In French = ETUC | European Trade Union Confederation | In English = EVV | Europees Verbond van Vakverenigingen | In Dutch |
In Spanish | → Labour, labour economics |
| CES | Confédération Européenne des Syndicats = ETUC, EVV (look above) |
In French | → Labour, labour economics |
| CESA | Canadian Engineering Standards Association | In English | → Standardization → Associations → Engineering, technology |
| CESCM | Centre d'Études Supérieures de Civilisation Médiévale (www.mshs.univ-poitiers.fr/cescm) | In French | → Research institutes → History |
| CESI | Confédération Européenne des Syndicats Indépendants = CESI | Confederación Europea de Sindicatos Independientes | In Spanish |
In French | → Labour, labour economics |
| CESI | Confederación Europea de Sindicatos Independientes = (look above) |
In Spanish | → Labour, labour economics |
| CESL | Confederación Europea de Sindicatos Libres | In Spanish | → Labour, labour economics |
| CESO | Canadian Executive Service Organization = SACO | Service d'Assistance Canadienne aux Organismes | In French |
In English | → Development |
| CESTAS | Centro di Educazione Sanitaria e Tecnologie Appropriate Sanitarie | In Italian | → Medicine |
| CESVI | Cooperazione e Sviluppo | In Italian | → Development |
| CETR | Corpul Expertilor Tehnici din România | In Romanian | → Applied sciences, technology |
| CETU | Centre d'Études des Tunnels | In French | → Research institutes → Civil engineering |
| CEVI | Confédération Européenne des Vignerons Indépendants | In French | → Agricultural sciences → Beverage industry |
| CEVI | Centro di Volontariato Internazionale | In Italian | |
| CEVO | Compascumer Erfscheidense Voetbal en Ontspanningsvereniging | In Dutch | → Sport, physical exercises |
| CEVU | Conseil des Études et de la Vie Universitaire | In French | → Higher education, universities |
| CEWC | Council for Education in World Citizenship | In English | → Education |
| CFA | Cat Fancier's Association (www.cfa.org) | In English | → Associations |
| CFA | Canadian Flag Association | In English | → Associations → 9299 |
| CFAR | Collège Français des Anesthésistes Réanimateurs | In French | → Anesthesiology |
| CFC | Community Foundations of Canada = FCC | Fondations Communautaires du Canada | In French |
In English | → Foundations |
| CFCG | Confédération Française du Commerce de Gros | In French | → Trade |
| CFCV | Collectif féministe contre le viol | In French | → Feminism |
| CFDT | Confédération Française Démocratique du Travail (www.cfdt.fr) | In French | → Labour, labour economics |
| CFDT | Confédération Française des Travailleurs | In French | → Labour, labour economics |
| CFE | Commission Fédérale des Étrangers | In French | → Migrations |
| CFE | Conseil de la Famille et de l'Enfance | In French | → Social welfare |
| CFE | Comisión Federal de Electricidad | In Spanish | → Central administration → Electrical engineering |
| CFEP | Chambre des Fonctionnaires et Employés Publics | In French | → Labour, labour economics → Public administration, government |
| CFH | Conference on Faith and History | In English | → Religion, theology → History |
| CFI | Center for Inquiry | In English | → Philosophy, psychology |
| CFIA | Canadian Food Inspection Agency (www.inspection.gc.ca) | In English | → Food technology |
| CFN | Conselho Federal de Nutricionistas | In Portuguese | → Nutrition |
| CFPB | Consortium Français de Participations Bancaires | In French | → 33677 |
| CFQ | Confédération Française de la Quincaillerie | In French | → Trade |
| CFR | Colegiul Farmacistilor din România | In Romanian | → Pharmacology, toxicology |
| CFTC | Confédération Française des Travailleurs Chrétiens | In French | → Labour, labour economics → Christianity |
| CFZ | Centrum Flagi Ziemi | In Polish | → 9299 |
| CGA | Confédération Générale de l’Agriculture | In French | → Agricultural sciences → History |
| CGB | Confédération Générale des planteurs de Betteraves (www.cgb-france.fr) | In French | → Agricultural sciences |
| CGB | Christlicher Gewerkschaftsbund | In German | → Christianity → Labour, labour economics |
| CGC | Confédération Générale des Cadres | In French | → Labour, labour economics |
| CGCEH | Conference Group for Central European History | In English | → History → Area studies |
| CGDI | Consejo General de los colegios oficiales de Decoradores Diseñadores de Interior | In Spanish | → Architecture |
| CGE | Conférence des Grandes Écoles | In French | → Specialized or (poly)technical colleges |
| CGIAR | Consultative Group on International Agricultural Research | In English | → Agricultural sciences |
| CGMP | Cercle Généalogique de Maine et Perche | In French | → Genealogy |
| CGMP | Centre Généalogique du Midi-Provence (www.cgmp-provence.org) | In French | → Genealogy |
| CGPME | Confédération Générale des Petites et Moyennes Entreprises | In French | → Labour, labour economics |
| CGPT | Confédération Générale des Travailleurs Paysans | In French | → Labour, labour economics → Agricultural sciences |
| CGS | Cinecircoli Giovanili Socioculturali | In Italian | |
| CGSAH | Conference Group for Social and Administrative History | In English | → Sociology → Public administration, government → History |
| CGSLB | Centrale Générale des Syndicats Libéraux de Belgique = ACLVB | Algemene Centrale der Liberale Vakbonden | In Dutch |
In French | → Labour, labour economics |
| CGT | Confédération Générale du Travail | In French | → Labour, labour economics |
| CGT | Confédération Générale des Travailleurs | In French | → Labour, labour economics |
| CGT-FO | Confédération Générale des Travailleurs - Force Ouvrière | In French | → Labour, labour economics |
| CGT-FO | Confédération Générale du Travail-Force Ouvrière | In French | → Labour, labour economics |
| CGTL | Confédération Générale du Travail Luxembourgeoise | In French | → Labour, labour economics |
| CGTL | Confédération Générale des Travailleurs du Liban | In French | → Labour, labour economics |
| CGTP | Confederação Geral dos Trabalhadores Portugueses | In Portuguese | → Labour, labour economics |
| CGTU | Confédération Générale du Travail Unitaire | In French | → Labour, labour economics → History |
| CHA | Canadian Hockey Association | In English | → Associations → Sport, physical exercises |
| CHA | Canadian Historical Association = SHC | Société Historique du Canada | In French |
In English | → Associations → History |
| CHA | Catholic Health Association | In English | → Associations → Roman catholic church → Medicine |